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Theorem tncp 21758
Description: There exist three non colinear points. (Contributed by FL, 3-Aug-2009.)
Hypothesis
Ref Expression
tncp.1  |-  P  = 
U. L
Assertion
Ref Expression
tncp  |-  ( L  e.  Plig  ->  E. a  e.  P  E. b  e.  P  E. c  e.  P  A. l  e.  L  -.  (
a  e.  l  /\  b  e.  l  /\  c  e.  l )
)
Distinct variable groups:    L, a,
b, c, l    P, a, b, c
Allowed substitution hint:    P( l)

Proof of Theorem tncp
StepHypRef Expression
1 tncp.1 . . . 4  |-  P  = 
U. L
21isplig 21757 . . 3  |-  ( L  e.  Plig  ->  ( L  e.  Plig  <->  ( A. a  e.  P  A. b  e.  P  ( a  =/=  b  ->  E! l  e.  L  ( a  e.  l  /\  b  e.  l ) )  /\  A. l  e.  L  E. a  e.  P  E. b  e.  P  (
a  =/=  b  /\  a  e.  l  /\  b  e.  l )  /\  E. a  e.  P  E. b  e.  P  E. c  e.  P  A. l  e.  L  -.  ( a  e.  l  /\  b  e.  l  /\  c  e.  l ) ) ) )
32ibi 233 . 2  |-  ( L  e.  Plig  ->  ( A. a  e.  P  A. b  e.  P  (
a  =/=  b  ->  E! l  e.  L  ( a  e.  l  /\  b  e.  l ) )  /\  A. l  e.  L  E. a  e.  P  E. b  e.  P  (
a  =/=  b  /\  a  e.  l  /\  b  e.  l )  /\  E. a  e.  P  E. b  e.  P  E. c  e.  P  A. l  e.  L  -.  ( a  e.  l  /\  b  e.  l  /\  c  e.  l ) ) )
43simp3d 971 1  |-  ( L  e.  Plig  ->  E. a  e.  P  E. b  e.  P  E. c  e.  P  A. l  e.  L  -.  (
a  e.  l  /\  b  e.  l  /\  c  e.  l )
)
Colors of variables: wff set class
Syntax hints:   -. wn 3    -> wi 4    /\ wa 359    /\ w3a 936    = wceq 1652    e. wcel 1725    =/= wne 2598   A.wral 2697   E.wrex 2698   E!wreu 2699   U.cuni 4007   Pligcplig 21755
This theorem is referenced by:  lpni  21759
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1555  ax-5 1566  ax-17 1626  ax-9 1666  ax-8 1687  ax-6 1744  ax-7 1749  ax-11 1761  ax-12 1950  ax-ext 2416
This theorem depends on definitions:  df-bi 178  df-or 360  df-an 361  df-3an 938  df-tru 1328  df-ex 1551  df-nf 1554  df-sb 1659  df-eu 2284  df-clab 2422  df-cleq 2428  df-clel 2431  df-nfc 2560  df-ral 2702  df-rex 2703  df-reu 2704  df-v 2950  df-uni 4008  df-plig 21756
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